NO. 3 



SOLAR VARIATION AND WEATHER — ABBOT 



47 



Fig. 38.— Phase adjustments for 6-coIumn combinations, Washington D.C., 

 temperature, 13%o-month period. 



Many have noticed that if a rain comes Saturday it may recur on 

 several succeeding Saturdays and after that on Fridays. We have 

 tabulated daily temperature in New York and Washington to in- 

 vestigate this observation. We discovered a well-marked period 

 (fig. 41) of 6.6456 days (later improved to 6.6485 days) and also the 

 half of it in the weather of New York and Washington. (See also 

 P. 2499, P. 3893, P. 3990, and P. 4015.) The period was found to be 

 within 1 percent or less of 1/1250 of 273 months as computed em- 

 ploying the exact period of the earth's revolution about the sun. 

 The shorter period is exactly 273/2500 months. 



2. Human pulse periods. 



My friend Dr. Frances P. Marshall has a 3-year daily record of 

 her pulse taken before rising each morning. She permits me to 

 publish my analysis of it (see P. 4265, pp. 15-17). A very smooth 



